USNS Mercy The USNS Mercy moors to the pier at Naval Base San Diego, Calif., upon returning from Pacific Partnership 2018, July 21, 2018. SHARE IMAGE: Download Image: Full Size (1.18 MB) Tags: Humanitarian Aid Photo By: Navy Petty Officer 2nd Class Zach Kreitzer VIRIN: 180721-N-PN275-1061.JPG Photo Gallery